<ion-tabs>
  <ion-tab [root]="tab1Root" (ionSelect)="transition($event)" tabTitle="主页" tabIcon="home"></ion-tab>
  <ion-tab [root]="tab2Root" (ionSelect)="transition($event)" tabTitle="发现" tabIcon="compass"></ion-tab>
  <ion-tab [root]="tab3Root" (ionSelect)="transition($event)" tabTitle="原生" tabIcon="game-controller-b"></ion-tab>
  <ion-tab [root]="tab4Root" (ionSelect)="transition($event)" tabTitle="设置" tabIcon="settings"></ion-tab>
</ion-tabs>
